Internal-combustion engine carburetor



Jan. 2, 1951 A. c. RUSSELL INTERNAL-COMBUSTION ENGINE CARBURETOR 2 Sheets-Sheet 1 Filed Nov. 24, 1947 E .62 a 40 fii'fllllllllllilllll Q lllllll I ATTORNEYS Jan. 2, 1951 A. c. RUSSELL INTERNAL-COMBUSTION ENGINE CARBURETOR 2 Sheets-Sheet 2 Filed Nov. 24, 1947 .llllllz'lll/lllm S Y E N R O T A Patented Jan. 2, 1951 OFFICE INTERNAL-COMBUSTION ENGINE oARBUnE'roR *Andrew Graig It-ussell',' Shaw-nee,kla. Application November 24, 94'7,"'se'ria1 No..-78 7,760;

This invention relates to internal combustion engine carburetors in the nature of that disclosed .in my U. S. Letters Patent No. 2,366,056, dated .TDecember 26, 1944, and is a continuationin part of my coepending application,.Serial'No. 646,767, "filed February 11, 1946, now abandoned.

"The most important objectof this inventionis Another objectof'this invention is to improve upon the carburetors forming the subject matter of my co-pending applications bearing the following serial numbers: 691,944, issued as Patent No. 2,506,812 on May 9, 1950; 700,202, now

' abandoned; 710,519, now abandoned; 747,409, now Patent No.2,529,665 issued on Nov. 14,' 1950;

and 765,978, now abandoned filed'August 21, 1946; September 30, 1946; November 18, 1946; May 12, 1947; and August 4, 1947 respectively.

Another important object of this invention is the provision of a carburetor having a mixing head interconnecting afuel bowl and an air inlet chamber, which head is formed integrally with a'partition separating said bowl'and chamber. v

Another object of the presentinvention is to provide a carburetor having a specially formed,

spring loaded, reciprocable valve for controlling the flow of air from an air chamber to a receiving compartment for fuel mixture, operable solely on suction created at an outlet opening communicating with said compartment.

Referrin to the drawings:

Fig. l is a top plan view of an internal combustion engine carburetor made in accordance with my present invention. 1

Fig. 2 is a side elevational view thereof.

Fig. 3 is a cross sectional view taken on irregular line IIIIII of Fig. 2. I

Fig. 4 is an elevational view showing one side thereof opposite to that shown in Fig. 2.

Fig. .5 is a cross sectional view taken on line VV of Fig. 1.

Fig. 6 is a cross sectional view taken on line VIVI of Fig. 1; and

Fig. '7 is a cross sectional view taken on line VII-VII of Fig. l.

The carburetor about to be described includes a hollow seotionalized casing broadly designated by the numeral Hi and formed to present a fuel bowl l2; an air chamber 14 and a receiving chamber l6.

t ,A centralsection'm of the casing lfl,i'haslthe receiving chamber l6 that is formed therein,

closed byja top section in the "form of a covering plate'20 through the medium of anumber of bolts or the like 22. A portion of the fuel bowl IZis also formed in this section l8, while the main part of bowl I2 is created by a cupelike section 24 that is secured to section [8 by bolts 26. Gas 'kets 28 and 30 are interposedbetween sections 1 8 and and sections I8 and 24 respectively.

A partition plate 32 interposed betweensections l8 and 24 and held in place by bolts 26, divides the fuel bowl l2 from the air chamber I4 that is disposed within the'section [8 of casing I0.

A bracket 34, integral with section l8'has. openings .36 formed therein to permit .mounting of thecarburetor onthe intake manifold of .anine ternal combustion engine and an outlet opening .38 communicating at. its innermost end with the receiving compartment I B, is provided with re.

flutter'valve" 46; This valve 46 is mountedon a rotatable "shaft 42 having a link 44 secured to its.outermostendexternally of casing [6. This withthe-engines accelerator (notshown).

arm 46 fastenedto link-44 by a screw 48 has ta link'44 may be connected in any suitable manner rm spring loaded adjusting screw 50 threaded therein and projecting therethroughfo'r engagement with a'stop pin 52mounted in section I 8. 1 An air inlet port154communicates with chamberl4and is provided with a choking valve 56 mounted on a rotatable shaft 58 having a control key 6|! at its uppermost end.

A float 62 within fuel bowl 26 is swingably mounted through the medium of an arm 64 that underlies a valve 66. This valve 66 is floatingly mounted in a fuel inlet plug 68 having connection through a conduit (not shown) with a source of fuel. Swinging movement of float 62 thus controls the opening and closing of valve 66, float 62 being set to maintain a section 16 of fuel bowl I2 full during operation of the carburetor. A breather plug 12 mounted in section l8 of casing: I 0 facilitates such operation. a

As shown in Fig. 7, the section 10 of fuel bowl I 2Jis' relatively shallow and channel-like in cross section, and has disposed therein the lowermost end of a mixing head 16. This mixing head 16 is integral with the plate 32 and also extends thereabove into the chamber I4.

A bore 18 through head 16 forms a mixing chamber above the level of fuel in bore 18, such fuel entering bore 18 at its lowermost end through a,--removable, perforated control plug -1 14 set screw'82 threaded in section 24 of easing lqjprovides a drain plug for fuel bowl i2 and also permits removal of plug 80 for cleaning or replacement.

A plurality of downwardly converging passages 84 formed in the uppermost portion of the head 16 are disposed to place bore i8 into communication with chamber is and direct air from the latter to the level of fuel in bore 18.

A wall 86, forming the bottom of the compartment, constitutes a portion of the top wall of chamber 54 and overlies the mixing head 16. An opening 38 formed in the wall 86 places the chamber I4 into communicationwith compartment I6.

A cup-shaped valve 90 has a central opening 92 therethrough for receiving the uppermost end of a conduit 9 upon which it is slidably mounted, The conduit 94 is threaded into mixing head 16 in register with the bore 18 and has its upper end disposed within the compartment It. A coil spring 96 circumscribing the uppermost end of conduit 94 is interposed between the innermost face of the bottom wall of valveflll and the plate '20 to yieldably hold valve 90 in closed relation to lopening 58. The side walls of valve 93 constitute ,a number of upstanding fingers 98 for holding spring 96 in place.

' In operation, suction created in the compartment l6 by the internal combustion engine draws 'air into the bore 18 through thepassages 84.

This same suction opens valve 90 to draw air into compartment it from chamber M by way of opening 88. When air impinges upon the level of fuel within the bore 18, vaporization takes place and this mixture of air passes upwardly through con duit 94 to further vaporize as it mixes with air passing into compartment 16.

The extent of opening of the valve 90, as compared with a predetermined degree of opening of the throttle valve 40 depends upon the tension of spring 98, and thus, as valve 40 is moved toward the open position, valve 90 will also move toward the fully open position to admit additional fuel mixture to the internal combustion engine.

Having thus described. my invention, what is claimed as new and desired to be secured by Letters Patent is:

" In a carburetor for internal combustion engines, a casing including a main section having an open bottom air compartment, an open top rea ceiving compartment, an inlet and an outlet opening communicating with said air compartment and with said receivin compartment respectively, and a perforated, normally horizontal partition between the air compartment and the receiving compartment; a vertically reciprocable valve in the receiving chamber and closing the perforation of the partition when resting on the latter; a removable cover secured to said main section and closing said open top of the receiving compartment thereof; a removable pan-like, fuel bowl section secured to the main casing section beneath the air compartment thereof; a horizontal plate clamped between said main section and said fuel bowl section, closing said open bottom of the aircompartment and separating the latter from the fuel bowl; a float chamber formed in said main section and in said fuel bowl section,

into communication with the receiving compartment by means of said bore, there being a number of inclined air passages formed in said head in- REFEREE CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,064,867 Stewart June 1'7, 1913 1,879,053 Boyce Sept. 27, 1932 2,118,038 Broderson et al May 24, 1938 2,159,294 Schimanek May 23, 1939 2,167,892 Kent et a1. Aug. 1, 1939 Russell Dec. 26, 194,4 

